tests/drivers/gpio/gpio_reserved_ranges: Fix missing includes

Revert the changes done in
b51f998
to this file.
Those 2 headers are indeed needed for it to build.

Signed-off-by: Alberto Escolar Piedras <[email protected]>

Author: aescolar

tests/drivers/gpio/gpio_reserved_ranges/src/main.c

@@ -9,6 +9,8 @@
 #include <zephyr/kernel.h>
 #include <zephyr/device.h>
 #include <zephyr/devicetree.h>
+#include <zephyr/drivers/gpio.h>
+#include <zephyr/drivers/gpio/gpio_utils.h>
 
 #define TEST_GPIO_1 DT_NODELABEL(test_gpio_1)
 #define TEST_GPIO_2 DT_NODELABEL(test_gpio_2)